Data Acquisition - · PDF file— Use a JTAG emulator or RS-232 serial ......

DT9840 SeriesScalable Real-Time DSPData Acquisition

Real-Time Performance— Simultaneous acquisition and control

of 8 analog input channels, 2 or 8analog output channels, 24 digital I/Olines, and 3 32-bit up/downcounter/timer channels.

— Embedded Texas InstrumentsTMS320C671x, 150 MHz, floating-point DSP processor for managing I/Ooperations.

— Sampling rates up to 100 kHz(800 kHz aggregate).

— Internal and external clocks andtriggers.Programmable DSP

— Run the DT Dynamic Signal Analyzerexample, included free with DTMeasure Foundry/RT-Streaming, tostream real-time data right out of thebox - without programming!

— Or, use the property pages of DTMeasure Foundry/RT-Streaming toconfigure a complete real-time systemeasily.

— Or, for maximum flexibility, develop acustom DSP application using ourextensive API libraries, TI CodeComposer Studio, and MicrosoftVisual Studio.Scalable Design

— Easily connect up to eight modules forhigh-channel count applications.

High-Speed USB 2.0 Host Interface— Transfer data between the module

and the host at rates up to480 Mbits/second.Easy Debugging

— Use a JTAG emulator or RS-232 serialdevice for easy debugging.Two Memory Configurations

— SDRAM option - great for most appli-cations.

— Flash and SDRAM option - great forrunning the module separately fromthe PC.

Two Packaging Configurations— The board-level version is available

for OEM embedded applications.— The Sleek Box packages the board-

level version in a CE-compliant boxwith standard signal connectors, USB2.0 cable, power supply, and fan.500 V Isolation

— Prevent ground loops to maximizeanalog signal integrity and protectyour computer.

DT9840 Series

DT9840 Series

Key Features DT9841 DT9842Typical Applications Noise and Vibration, Biomedical, Fast Control Loops, Automotive Test,

Acoustics/Sonar, Modal Analysis Rotating Machinery, Adaptive FilteringA/D and D/A Converter Delta-Sigma Successive-ApproximationResponse Time (at 100 kHz) 370 µs 10 µsA/D and D/A Filtering Yes NoResolution 24 bit 16 bitsA/D Signal Type Differential Single-endedSignal-to-Noise Ratio 110 dB 86 dBSampling Rate 200 Hz to 100 kHz 0 to 100 kHzNumber of Analog Outputs 2 Simultaneous 2 Simultaneous (DT9842/2)

8 Simultaneous (DT9842/8)Analog Output Range +/-10 V, +/-2.5 V +/-10 V

Figure 1. DT9840 Series modules are available in two configurations: Sleek Box and board-level version.

Type: DSP Real-Time Measurement and Control

BUS: USB

Figure 2. The Sleek Box is available for easy access to all signals.

Complete metal shielding and EMIprotection to preservehigh-accuracy signal measurement

Digital I/O andcounter/timers accessiblevia D-Sub connectors

Access all analog I/O func-tions via BNC or D-Subconnectors

Power, clock, and triggeravailable on front panel

Power switch andLED indicator

Scalable Buscommunication ports

Serial port foreasy debugging

USB 2.0connector

+ 5 V power input

Easy Signal ConnectionsSleek Box - Front Panel Sleek Box - Back Panel

Figure 3. The Sleek Box encloses the DT9840 Series module in a rugged, shielded metal box.

Sleek Box AssemblyIncludes Board-Level Version

CE-compliant enclosure

DT9840 Series board-level version

Front panel includes BNCs for easysignal connections

WWW.DATATRANSLATION .COM US & CANADA (800) 525-8528 GERMANY (49) 7142 95310 UK (44) 1256 333330 2

USB 2.0 Interface

Scalable Real-Time DSP Data AcquisitionBoard-Level Version

Power and Status LED

PowerIn

500 VoltIsolation

Scalable BusExpansion

SerialPort

8 LEDsfor debug

JTAGPort

TMS320C671X DSP

SDRAM Memory

FLASH Memory

Ext.Trigger

Ext.ClockPower

Out

DIO & 332-Bit

Up/DownCounter/Timers

AnalogOut

AnalogIn

J18 J17

Figure 4. The board-level version of the DT9840 Series module shows the component layout and subsystem access. The version picturedabove has 2 MBytes of Flash and 64 MBytes of SDRAM memory.

DT9840 Series


BUS: USB

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Figure 5. The DT9840 Series is an intelligent data acquisition system optimized for the highest performance, real-time data acquisition anddigital signal processing applications. A unique architecture tightly couples A/D and D/A converters to a DSP engine to allowsimultaneous data collection and analysis, and host communications.

OverviewThe DT9840 Series is a complete dataacquisition system for real-time signalcapture and processing. With a varietyof I/O and programming options, theDT9840 Series provides an ideal plat-form for real-time applications.

Included in the series are theDT9841, DT9842/2, and DT9842/8modules. Each module contains anembedded DSP processor for real-timecontrol and a high-speed USB 2.0 inter-face for communicating to a host PC.The DT9841 module features 24-bitDelta-Sigma converters - great for noiseand vibration testing. The DT9842/2and DT9842/8 modules feature 16-bitsuccessive-approximation converters -great for fast control loop operations.

All modules provide simultaneousacquisition and control of up to 8 ana-log input channels, 2 analog outputchannels (8 on the DT9842/8), 24 digi-tal I/O lines, and 3 32-bitcounter/timer channels at up to 100kHz. And, if you need more I/O, simplyconnect up to eight DT9840 Seriesmodules together! A variety of memoryand packaging configurations are avail-able to suit your application needs.

To get up and running quickly, usethe DT Dynamic Signal Analyzer appli-cation, included with DT MeasureFoundry/RT-Streaming, to stream real-time data between the PC and yourDT9840 Series module right out of thebox - without programming! You canmodify this application as you wish orconfigure a complete real-time systemusing the property pages of DT MeasureFoundry/RT-Streaming. Or, if you needmore flexibility, develop your own low-level DSP application using TI CodeComposer Studio. Select the softwaresolution that's right for you!

Simultaneous Analog InputsThe DT9841 module offers 8, 24-bitanalog input channels with built-inanti-aliasing filters for superior AC per-formance in noise and vibration testingapplications. All analog input channelsare configured for differential mode andsupport an input range of +/-10 V.

The DT9842/2 and DT9842/8 mod-ules offer 8, 16-bit analog input chan-nels (without filtering) for fast control-loop applications, such as predictivemaintenance and servo loop applica-tions. All analog input channels areconfigured for single-ended mode and,like the DT9841, support an inputrange of +/-10 V.

When clocked by either the internalor external clock, all analog input chan-nels, digital input lines, andcounter/timer channels are simultane-ously sampled at up to 100 kSamples/s(800 kHz aggregate). Using software,you can scan all the analog inputseither a specified number of times orcontinuously. You can also read a sin-gle value from a single input channel, ifdesired.

Internally, the DT9841 module uses aDelta-Sigma converter for each analoginput, while the DT9842/2 andDT9842/8 modules use a successive-approximation converter for each ana-log input.

Delta-Sigma converters offer the fol-lowing advantages for analog inputoperations, making them ideal for noiseand vibration testing applications:

Reduce noise and improve accuracy byoversampling each input up to 64times.Eliminate errors that result from alias-ing and high frequency noise by usinga built-in decimation filter when sam-pling between 200 Hz and 5 kHz.

Provide excellent low-level signal-to-noise performance, which improvesdynamic accuracy on low-level sig-nals.Provide excellent differential linearity,which ensures consistently accuratedata conversion across the full inputrange.Because of their inherent filtering

algorithms, though, Delta-Sigma con-verters also have an initial delay of 37clock pulses (370 µs at 100 kHz) afterthe sample clock is first started andbefore the first conversion is completed.Thereafter, the data is converted with-out delay (at 100 kHz, sampling occursevery 10 µs).

In fast control-loop applications, thisinitial delay is unacceptable. For theseapplications, successive-approximationconverters are the best choice.Successive-approximation convertersalways run as fast as possible becauseno filtering is performed (at 100 kHz,sampling occurs every 10 µs). In addi-tion, they have extremely low apertureuncertainty (5 ns jitter) for minimalphase error and very accurate compari-son/correlation of high-speed analogsignals.

Waveform Quality Analog OutputsThe DT9841 module supports two, 24-bit waveform analog outputs with anoutput range of ±10 V or ±2.5 V. A soft-ware-selectable filter of 5 kHz or 20 kHzis available for each channel forsmoothing the output value.

The DT9842/2 module supports two,16-bit waveform analog outputs andthe DT9842/8 module supports eight,16-bit waveform analog outputs. Eachanalog output channel provides an out-put range of ±10 V. Each analog outputis deglitched to a small 10 nV secondspike for all the major and minor bitcarries.

When clocked by either the internalor external clock, all the analog outputsand digital outputs are simultaneouslyupdated at up to 100 kSamples/s (200kHz or 800 kHz aggregate). Using soft-ware, you can update all the analogoutputs either a specified number oftimes or continuously. You can alsogenerate a waveform for each analogoutput channel or write a single valueto a single output channel, if you wish.

Internally, the DT9841 module usesindependent Delta-Sigma converters foreach analog output channel. At fre-quencies between 200 Hz and 5 kHz,the Delta-Sigma converters automati-cally interpolate between data points toeliminate any aliasing effects on theoutput signals. This interpolationresults in a glitch-free transition.

The DT9842/2 and DT9842/8 mod-

Key Features

Embedded DSP Processor Texas Instruments TMS320C671X,150 MHz, floating-point

Host Interface High-speed USB 2.0# of Analog Inputs 8# of Analog Outputs 2 on the DT9841 and DT9842/2, 8 on the DT9842/8# of Digital I/O Lines 24 # of Counter/Timer Channels 3 32-bit Up/DownIsolation 500 V galvanicDebugging JTAG emulator or RS-232 serial deviceMemory Configurations SDRAM option (-R) or Flash and SDRAM option (-F)

Packaging Configurations Sleek Box (-SB) or Board-Level Version

Software ChoicesReady-to-Measure application Dynamic Signal Analyzer application exampleQuick system configuration DT Measure Foundry/RT-StreamingMaximum flexibility TI Code Composer Studio and

Microsoft Visual Studio


The DT9842/2 and DT9842/8 mod-ules, in contrast, use successive-approximation converters for unfilteredoutputs with fast response times.

High-Speed Digital I/O LinesAll DT9840 Series modules featurethree 8-bit ports (24 lines) that you canprogram for digital input or digital out-put operations using software.Interrupt-on-change is also supportedfor the first port. This feature is usefulwhen you want to monitor critical sig-nals or when you want to signal thehost computer to transfer data to orfrom the module. You can also enabledeglitching circuitry on this port to pre-vent situations where multiple inter-rupts can occur for one state change.

When clocked by either the internalor external clock, all the digital inputlines, analog input channels, andcounter/timer channels are simultane-ously sampled at up to 100kSamples/s. At the same time, all thedigital output lines and analog outputchannels are updated at the same clockrate. Using software, you can read allthe digital input lines or update all thedigital output lines either a specifiednumber of times or continuously. Youcan also read a single value from a sin-gle digital input line or update a singledigital output line, if you wish.

On power up or reset, no digital datais output from the modules. All the out-puts include diode protection to the iso-lated ground and the isolated +5 V.

Up/Down Counter/TimersAll DT9840 Series modules providethree 32-bit counter/timer channelswith programmable C/T clocks, gates,edges, and pulse output parameters.

You can use these counter/timers toperform standard counting operations,such as event counting and rate gener-ation, as well as up/down counting,one-shot, and repetitive one-shot opera-tions. Additionally, you can measurethe period or frequency of a signalbetween programmable clock or gateedges.

You can also read the value of all thecounter/timer channels at the sametime as the analog input channels anddigital input lines at up to 100 kHz.

Easy Channel ExpansionFor high-channel count applications,use the Scalable Bus connectors on themodule and the shielded EP342 cableto connect up to eight modules togetherfor up to 64 analog I/O channels, 192digital I/O lines, and 24 counter/timer

channels. If you wish, you can synchronize the

operation of all modules using theScalable Bus master clock. In this con-figuration, one module is the masterand the other modules are slaves. Youcan use either an internal or external

clock source to pace the master mod-ule. The Scalable Bus master clockresets the slave modules and pacesthem at the same rate as the mastermodule. The first and last modules inthe chain must be terminated with soft-ware-selectable 100 terminationresistors.Programmable TriggersThe DT9840 Series supports an inter-nal and external trigger for starting allthe I/O operations on the module.

Using the internal trigger, I/O opera-tions start based on a software com-mand. Using an external trigger, I/Ooperations start when the moduledetects a low-to-high transition on theExt Trig input of the module. Connect aTTL-level signal to the Ext Trig BNC onthe module.

Programmable ClocksAll DT9840 Series modules support aninternal and external clock for pacingI/O operations. These clocks are sharedby all I/O subsystems.

On the DT9841, the internal clockhas a 36 MHz time base and supportssampling frequencies between 200 Hzand 100 kHz. On the DT9842/2 andDT9842/8, the internal clock has an 18

MHz time base and supports samplingfrequencies between 0 Hz and 100 kHz.Use software to specify the samplingfrequency you want.

If you want to use an external clockto pace I/O operations, connect a TTL-level signal to the Ext Clk BNC on themodule. For the DT9841, ensure thatfrequency of the external clock signalthat you connect to the module has a50% duty cycle, is 256 times the actualclock frequency you want, and has aresulting clock frequency between 200Hz and 100 kHz. For example, if youneed a sampling frequency of 100 kHz,use an external clock source with a fre-quency of 25.6 MHz. For the DT9842/2and DT9842/8, the frequency of thesignal that you connect to the Ext Clkinput is the clock frequency that isused.

High-Speed USB 2.0 HostInterfaceAll DT9840 Series modules use a high-speed USB 2.0 interface, which pro-vides transfer rates between the moduleand the host at up to 480 Mbits/s. TheDT9840 Series can also be used withUSB 1.1 ports, but at USB 1.1 perform-ance (12 Mbits/s).

500 V Galvanic Isolation Computers are susceptible to ground-spikes through any external port. Thesespikes can cause system crashes andmay even cause permanent damage toyour computer. DT9840 Series modulesfeature 500 Volts of galvanic isolation toprotect your computer from ground-spikes and to ensure a reliable streamof data.

Multiple Memory ConfigurationsDT9840 Series modules are available intwo memory configurations:

SDRAM (-R) - provides 128 MBytes ofSDRAM memory.Flash and SDRAM (-F) - provides64 MBytes of SDRAM and 2 MBytesof Flash memory.With the RAM memory configuration,

you can download a DSP program fromthe PC directly to the SDRAM memoryon the module and run it. The programresides in memory as long as the modulestays powered on. The module does notneed host intervention (eliminating anyWindows latencies) and can run on itsown, monitoring and controlling data. Ifthe PC becomes disconnected acciden-tally, data is preserved, ensuring thesecurity of mission-critical applications.

DT9840 Series


BUS: USB

Figure 6. Due to its scalable design, youcan easily expand your I/O capability byconnecting up to 8 DT9840 Series modulestogether.

With the Flash memory configuration,you can download a DSP program to theSDRAM on the module, run and debugit, then store it in Flash memory. Once itis stored in Flash, the DSP programautomatically restarts on it own, inde-pendent of the PC, each time the moduleis powered on.

Memory is shared by the I/O subsys-tems, onboard DSP processor, andScalable Bus. Each subsystem has itsown high-speed pathway in and out ofmemory, and each pathway has its ownindependent DMA controller. This allowsI/O subsystems to operate withoutprocessor intervention.

Multiple PackagingConfigurationsDT9840 Series modules are available intwo packaging configurations:

Sleek Box version (-SB).Board-level version.The Sleek Box packages the board-

level version of the DT9840 Series mod-ule in a CE-compliant box with standardsignal connectors, USB cable, powersupply (EP348), and fan. This configura-tion is great for easy signal connections.A removable side panel allows directaccess to the JTAG connector for debug-ging purposes.

The board-level version is available forOEM embedded applications, and shipswith a USB cable. An +5 V AC to DCpower supply is required for operation,and is available separately as EP348.

Many Software ChoicesA number of software choices are pro-vided to allow users of all levels - fromprogrammers to application users - theability to access the DT9840 Series:

The DT Dynamic Signal Analyzer,included with DT MeasureFoundry/RT-Streaming, helps you toget up and running quickly. You canstream real-time data between the PCand your DT9840 Series module rightout of the box!

The DT Dynamic Signal Analyzer is aReady-to-MeasureTM application thatautomatically configures the DT9840Series hardware, performs oscillo-scope, spectrum analyzer, digitalvoltmeter, and function generatoroperations, and streams data to andfrom the host PC - all without pro-gramming! You can modify thisapplication as you wish or configurea complete real-time system usingDT Measure Foundry/RT-Streaming. DT Measure Foundry/RT-Streamingis a user-configurable, real-timedevelopment package that makesdeveloping applications simple andfast. Using property pages, you caneasily configure real-time tasks likedata collection, data display, signalprocessing, and streaming to disk.Programming blocks support customalgorithm development. DT MeasureFoundry/RT-Streaming is alsoMATLAB® and Excel® compatible.DT Measure Foundry/RT-Streamingautomatically downloads the requiredCOFF files to the module in the back-ground.Use TI Code Composer Studio formaximum flexibility. Using CodeComposer, you can develop your ownlow-level DSP applications to run instand-alone mode or to communicatewith your own Windows applicationwritten in Microsoft Visual Studio.Each DT9840 Series module comeswith a device driver, a full set of I/Oand communication API libraries forthe DSP and host PC, example pro-grams and utilities, and completedocumentation.

Figure 7. Download your DSP program to SDRAM memory on the DT9840 Series module. The module can then run on its own, monitoringand controlling data. With the Flash memory configuration, you can store this program in Flash memory. The DSP program can then restartautomatically, independent of the PC, each time the module powers on.

Figure 8. Removable side panel allowsdirect access to the JTAG port for programdevelopment and debug purposes. LEDs arealso viewable for debugging through thispanel.

Figure 9. The EP348 power supply isincluded with the Sleek Box and is availableas an accessory for the board-level version.


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Figure 10. The DT Dynamic Signal Analyzer automatically configures DT9840 Series hardware for real-time streamingto/from a host PC without programming!

Oscilloscope Panel:Stream and analyze signals on one or all 8 channels inreal-time

Zoom/pan, autoscale, or freeze live signalsPrint or save signals to diskOpen and post-analyze saved signal from disk

DT DDynamic SSignal AAnalyzer AApplication EExampleSpectrum Panel:

Stream data in and perform up to a 128K point FFT on one or all8 channels

Many FFT types: spectrum analyzer, autocorrelation, power spectrumMany windows functions, including Rectangle, Hann, BlackmanSelect linear, logarithmic, or dB view for Y-axis scale

Configuration Panel:Automatically configuresDT9840 Series

Selectable input samplingfrequency from 10 kHz to100 kHz

Selectable input audiosampling frequencies from11.025 kHz to 96 kHz

DVM Panel:24-bit resolution provides6.5-digit Digital Volt Meterfor all 8 channels

Selectable upper- and lower-limit range

Warning LED indicator forvalues in or out of limitrange

Function Generator Panel:Generate DC, Sine Wave, Square Wave, Ramp, Triangle, and Arbitrary Waveforms Set frequency, amplitude, offset, duty cycle, sweep rate, and sweep widthLoad and play standard waveform signals from file (supports all .WAV, .DCF, or ASCII files)

Figure 11. DT Measure Foundry/RT-Streaming is a user configurable, real-time development package that makes developing applicationssimple and fast. Using property pages you can easily configure real-time tasks. The COFF file is automatically downloaded to the module inthe background.

DT9840 Series


BUS: USB

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Figure 12. For maximum flexibility, you can develop your own low-level DSP applications using TI Code Composer Studio. You can developDSP programs to run in stand-alone mode or to communicate with your own Windows application written in Microsoft Visual Studio.


Easy Signal ConnectionsThe Sleek Box version of the module, shown in Figure 2, provides BNCs for all the analog I/O, external trigger, and externalclock signals. You can also access the analog I/O and digital I/O signals through 37-pin D-sub connectors on the front panel.A 25-pin D-sub connector is provided on the front panel for accessing the counter/timer signals.

The board-level version of the module, shown in Figure 4, provides two 68-pin connectors for accessing all of the analogI/O, digital I/O, and counter/timer signals, and BNCs for attaching external trigger and clock signals.

Both versions of the module also provide Scalable Bus connectors for attaching up to 7 additional modules, a serial portconnector and JTAG connector for easy debugging, a power input and output connector, and a USB 2.0 connector for attach-ing to a host computer.

Analog Input Subsystem Specifications

Feature DT9841 Specifications DT9842 Specifications

Number of analog inputs 8 differential, simultaneously sampled 8 single-ended, simultaneously sampledand held (SSH) and held (SSH)

Number of gains 1 (the value is always 1) 1 (the value is always 1)Resolution 24 bits 16 bitsData encoding Twos complement Twos complementSystem accuracy (full-scale) 0.01% 0.01% Nonlinearity (integral) ±4096 LSBs ±0.01%Differential linearity (monotonic) ±64 LSBs ±1 LSB1 LSB 1.192 µV (20 V/224) 305 µV (20 V/216) Input signal range ±10 V ±10 VCoupling DC DCZero error ±0.001 V ±0.001 VDrift

Zero: ±40 µV/°C ±20 µV/°CGain: ±100 ppm/°C ±25 ppm/°C

Input impedance 100 MΩ 10 pF 100 MΩ 10 pFInput bias current ±10 nA ±10 nACommon mode voltage ±11 V maximum (operational) ±11 V maximum (operational)Maximum input voltage ±25 V maximum (protection DC) ±25 V maximum (protection DC)Internal reference +2.5 V ±0.002 V +2.5 V ±0.002 VA/D converter noise 16 LSBs rms 0.75 LSBs rmsChannel-to-channel offset ±700 µV ±700 µVChannel-to-channel aperture match ±5 ns ±3 nsAperture jitter 100 ps rms 10 ps rmsA/D conversion time 10 µs 8 µsA/D type Delta-Sigma Successive ApproximationGroup delay (DT9841) 370 µs @ 100 kHz (37/Throughput) —Pass-band 0.453 x Throughput —Stop-band 0.547 x Throughput —Signal/(Noise + Distortion) -92 db @ 1 kHz -86 db @ 1 kHzSpurious Free Dynamic Range 110 dB 90 dB Channel crosstalk 100 dB @ 1 kHz 100 dB @ 1 kHzData Throughput

Single channel: 100 kS/s 100 kS/sScan all eight channels: 800 kS/s 800 kS/s

Accuracy of Clock Oscillator 0.01% 0.01%

DT9840 Series


BUS: USB

Analog Output Subsystem Specifications

Feature DT9841 Specifications DT9842 SpecificationsNumber of analog output channels 2 2 for the DT9842/2

8 for the DT9842/8Resolution 24 bits 16 bitsData encoding Twos complement Twos complementNonlinearity (integral) ±1024 LSBs ±0.01%Differential linearity ±64 LSBs ±1 LSBZero error Software-adjustable to zero Software-adjustable to zeroGain error) ±2048 LSBs ±2 LSBsOutput ranges ±10 V and ±2.5 V (bipolar) ±10 V (bipolar)Throughput (full-scale) 100 kHz 100 kHzCurrent output ±5 mA minimum (10 V/ 2 kΩ) ±5 mA minimum (10 V/ 2 kΩ)Output impedance 0.3 Ω typical 0.3 Ω typicalCapacity drive capability 0.001 µF minimum (no oscillations) 0.001 µF minimum (no oscillations)Protection Short circuit to analog common Short circuit to analog commonPower-on voltage 0 V ±10 mV maximum 0 V ±10 mV maximumSettling time to 0.01% of FSR 10 µs, 20 V step 10 µs, 20 V stepTotal harmonic distortion -94 dB -88 dBGlitch area Glitch-free 10 nV - Seconds, typical, deglitchedSlew rate 5 V/µs 5 V/µsGroup delay 34/conversion rate 340 µs @ 100 kHz —Passband 0.454 x Throughput —Stopband 0.546 x Throughput —Pass-band ripple ±0.002 dB —Software-selectable 4-pole filter 20 kHz or 5 kHz —FIFO DSP memory DSP memory

Digital Input Subsystem Specifications

Feature SpecificationsNumber of lines 24 (Ports 0, 1, and 2 consisting of 8

programmable digital I/O lines)a

Termination 22 kΩ pull-up series 22 ΩInput type HCT+5 V tolerant YesInput load 22 kΩ pull-up to 3.3 VInputs

Input type: Level sensitiveInput load: 1 (HCT)High-level input voltage: 2.4 V minimumLow-level input voltage: 0.8 V maximumHigh-level input current: 0 µALow-level input current: 0.2 mA

Back EMF diodes Yes


a When Port 0 is configured for input, you can configure the software to interrupt the host computer whenever any of the 8 bits changes state.

DT9840 Series


BUS: USB

Digital Output Subsystem Specifications

Feature SpecificationsNumber of lines 24 (Ports 0, 1, and 2 consisting of 8

programmable digital I/O lines) Termination 22 kΩ pull-up series 22 ΩOutputs

Output driver: CMOSOutput driver high voltage: 22 kΩ pull-up to 3.3 VOutput driver low voltage: 0.4 V @ 10 mA

Back EMF diodes Yes

External Clock Specifications

Feature SpecificationsInput type HTC Rising-Edge Sensitive with

22kΩ pull-up resistorHigh-level input voltage 24 V minimumLow-level input voltage 0.8 V maximumMinimum pulse width 9 ns (high); 9 ns (low)Maximum frequency

DT9841: 51.2 MHza

DT9842 and DT9842/8: 100 kHz

Counter/Timer Subsystem Specifications

Feature SpecificationsNumber of counter/timer channels 3Clock Inputs

Input types: HCT with 22 kΩ pull-up to 3.3 VHigh-level input voltage: 2.4 V minimumLow-level input voltage: 0.8 V maximum+5 V tolerant YesMinimum pulse width: 25 ns (high); 25 ns (low)Maximum frequency: 20 MHz

Gate Inputs:Input type: HCT with 22 kΩ pull-up to 3.3 VOutput driver low voltage 0.4 V maximum @ 2 mA SinkHigh-level input voltage: 2.4 V minimumLow-level input voltage: 0.8 V maximum

+5 V tolerant YesMinimum pulse width: 25 ns (high); 25 ns (low)

Counter OutputsOutput driver high voltage: 3.0 V minimum @ 0.1 mA SourceOutput driver low voltage: 0.4 V maximum @ 2 mA Sink

a For the DT9841, the conversion rate = clock frequency/512.


External Trigger Specifications

Feature SpecificationsInput type HTC Rising-Edge Sensitive with

22kΩ pull-up resistorHigh-level input voltage 24 V minimumLow-level input voltage 0.8 V maximumMinimum pulse width 50 ns (high); 50 ns (low)Maximum frequency 50.0 kHz

Regulatory Specifications

Feature SpecificationsEMI FCC part 15, class A EN 55022:1994 (based on

CISPR-22:1993)EN 50082-1:1998

IEC 801-2:1984: 8 KV through air discharge/3 V/m from 27 to 500 MHz

IEC 801-3: 1 KV coupled to AC linesIEC 801-4: 0.5 KV coupled to I/O lines

VCCI (Japan version of CISPR-22)Safety: UL, CSA

Power, Physical, and Environmental Specifications

Feature SpecificationsPower

+5 V ±0.25 V: 5 A maximum (3 A typical)+5 V Isolated Power Out 1 A maximum

Physical DimensionsBoard-Level: 233.35 mm x 220 mmSleek Box: 229 mm (L) x 247 mm (W) x 114 mm (H)

WeightBoard-Level: 1.534 lbs (696 g)Sleek Box: 5.85 lbs (2.654 kg)

EnvironmentalOperating temperature range: 0° C to 45° CStorage temperature range: -25° C to 85° CRelative humidity: To 95%, noncondensingAltitude: 10,000 feet

DT9840 Series DocumentationThe following manuals are shipped onthe CD-ROM supplied with the DT9840Series module:

Getting started manual - Describeshow to how to install and set up amodule and verify that it is workingproperly.

User's manual - Describes the hard-ware features of the modules.

DSP library manual -Describes theI/O and communication API librariesthat are provided for programmingthe DSP on the module with CodeComposer Studio.

Host communication library manual -Describes the Windows library for thehost that is provided for communicat-ing with a DT9840 Series moduleusing Microsoft Visual Studio.

Technical SupportAs you develop your application, appli-cation engineers are available duringnormal business hours to discuss yourrequirements. Extensive information isavailable 24 hours a day on our website at www.datatranslation.com,including drivers, example code, pinassignments, a searchableKnowledgeBase, and much more.Support is also available from yourpoint of purchase. Telephone support isfree for the first 90 days; you can alsorequest complimentary support viaemail or fax at any time.

Accessories (Sold Separately)Each DT9840 Series module is shipped with a USBcable, device drivers for Microsoft Windows2000/XP, DSP library, host communication library,and comprehensive manuals in PDF form. Manualsare available in hard-copy form for an additionalcharge.The Sleek Box version also ships with the EP348power supply.The following accessories are available:

EP342 — 0.1m shielded 50-pin cable for con-necting multiple DT9840 Series modules usingthe Scalable Bus.EP348 — 5V, 6A optional power supply (withincluded power cable).EP354 — RS-232 adapter converts serial outputto standard RS-232.

Supported SoftwareDT Dynamic Signal Analyzer application example(provided with DT Measure Foundry/RT-Streaming)DT Measure Foundry/RT-StreamingTI Code Composer (2.1 or 2.2)Microsoft Visual Studio (6.0 or greater)

System RequirementsPC with Pentium 233 MHz processor minimum64 MB minimum of RAM; 128 MB orhigher recommendedWindows 2000 (with Service Pack 4) or WindowsXP Professional Edition (with Service Pack 1)USB Ports — one or more (version 2.0 or 1.1)Super VGA (800 x 600) or higher-resolutionmonitorCD-ROM drives — one or more

DT9840 Series


BUS: USB

Module Ordering Summary

Ordering Summary

Model Number Module Type Memory Configuration Packaging ConfigurationDT9841-R DT9841 SDRAM Board-level versionDT9841-F DT9841 Flash and SDRAM Board-level versionDT9841-R-SB DT9841 SDRAM Sleek BoxDT9841-F-SB DT9841 Flash and SDRAM Sleek BoxDT9842/2-R DT9842/2 SDRAM Board-level versionDT9842/2-F DT9842/2 Flash and SDRAM Board-level versionDT9842/2-R-SB DT9842/2 SDRAM Sleek BoxDT9842/2-F-SB DT9842/2 Flash and SDRAM Sleek BoxDT9842/8-R DT9842/8 SDRAM Board-level versionDT9842/8-F DT9842/8 Flash and SDRAM Board-level versionDT9842/8-R-SB DT9842/8 SDRAM Sleek BoxDT9842/8-F-SB DT9842/8 Flash and SDRAM Sleek Box

Data Acquisition - · PDF file— Use a JTAG emulator or RS-232 serial ......

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